(This courseware is the courseware of Li Huoming, a podcast of wisdom transmission. If you download the video tutorial of Android, you can refer to this courseware to preview the content of the upcoming lecture in advance. The courseware is divided into eight days to learn the effect of getting twice the result with half the effort. The knowledge points of the lecture involve the contents of the Java network, j2seIO, xml, dom parsing, sax parsing, and struts. If you want to learn more about xml and understand more about struts, you can refer to Li Gang, the general director of Guangdong, who is in charge of the Smart Podcast, "Practical Use of Lightweight Java EE Enterprises" or the video tutorial of MLDN Magic Technology. This document includes the following annexes:)